A colourless water-based flame retardant designed for use with natural, biobased materials including paper, cardboard, thin plywood, natural fabrics and cellulose fibres. Treated materials meet the requirements of DIN 4102, Class B 1. With the focus on sustainability of recent years, plastics have been replaced with more natural alternatives which can be much more flammable; by treating with Bioretard you can minimise this risk. Application by immersion, brushing or spraying.